292results about How to "Simulation results are accurate" patented technology

A Flogrid Simulation Gridding Program includes a Flogrid structured gridder. The structured gridder includes a structured areal gridder and a block gridder. The structured areal gridder will build an areal grid on an uppermost horizon of an earth formation by performing the following steps: (1) building a boundary enclosing one or more fault intersection lines on the horizon, and building a triangulation that absorbs the boundary and the faults; (2) building a vector field on the triangulation; (3) building a web of control lines and additional lines inside the boundary which have a direction that corresponds to the direction of the vector field on the triangulation, thereby producing an areal grid; and (4) post-processing the areal grid so that the control lines and additional lines are equi-spaced or smoothly distributed. The block gridder of the structured gridder will drop coordinate lines down from the nodes of the areal grid to complete the construction of a three dimensional structured grid. A reservoir simulator will receive the structured grid and generate a set of simulation results which are displayed on a 3D Viewer for observation by a workstation operator.

The invention discloses a device for simulating crack initiation and evaluating fissured flow under true triaxial stress and belongs to the field of fracture acidizing. The device disclosed by the invention comprises a rock core clamping system, a true triaxial stress loading system, an acid liquor and fracturing fluid injection system, a filtration capacity measuring system and a fracturing data acquisition and processing system, wherein the rock core clamping system is used for clamping a cubic rock core sample which has the side length of 100-300mm and a simulation wellbore is embedded inside the rock core sample; the true triaxial stress loading system is used for applying stresses on the rock core sample in an X axis direction, a Y axis direction and a Z axis direction, so as to simulate a true triaxial stress state of the rock core sample; the acid liquor and fracturing fluid injection system is used for injecting acid liquor and fracturing liquid into the simulation wellbore of the rock core sample, so that crack initiation is carried out on the rock core sample and a fracture extends to simulate the fracture acidizing process of the rock core sample; the filtration capacity measuring system is used for injecting saline water into the rock sample subjected to crack initiation, thus data representing filtration capacity of the fracture of the rock core sample are measured; and the fracturing data acquisition and processing system is used for acquiring data representing a simulated crack initiation process in the rock core sample and data representing the filtration capacity of the fracture in the rock core sample, processing the data and outputting a processing result.

The method and system of the present invention allow a designer of a mechanical system to quickly and easily determine the optimal design for the system. The steps include creating models of the mechanical system and simulating the performance of the models to achieve a set of results. From these results, Response Surface Models can be determined. These Response Surface Models act as surrogates for the more complex models of the mechanical system, and can be used to optimize the performance of the system. If necessary or desired, these Response Surface Models can be optimized over a range of possible values for the design parameters to achieve a robust design.

A method of dressing a polishing member with a diamond dresser having diamond particles arranged on a surface thereof is provided. The method includes determining dressing conditions by performing a simulation of a distribution of a sliding distance of the diamond dresser on a surface of the polishing member, and dressing the polishing member with the diamond dresser under the dressing conditions determined. The simulation includes calculation of the sliding distance corrected in accordance with a depth of the diamond particles thrusting into the polishing member.

The invention discloses a simulation method for calculating the lightning back-striking performance of UHV transmission lines. The simulation method comprises the following steps: dividing wires among long-span transmission towers into a plurality of line segments, establishing a distributed parameter circuit model for each line segment, establishing a multi-wave impedance model for each tower, then selecting the lightning parameters according to lightning activities, integrating all models and calculating the lightning withstand level, and calculating to obtain the back-striking trip rate of the UHV transmission lines according to the lightning withstand level and a series of formulae. The simulation method disclosed by the invention establishes the distributed parameter models of the line segments in consideration of high long-span transmission towers and long line spans, subdivides the wave impedance of different parts of the towers, and establishes the multi-wave impedance models in consideration of the refraction and reflection processes of lightning waves on the tower bodies so as to make the simulation results more precise and practical.

The invention relates to a display system for comparing and observing the growth of plant root systems under different growing conditions, particularly to a display system which utilizes water culture method for parallel cultivation, can satisfy continuous growth requirements of plants and is used for observing growth comparison experiments of plant root systems. The display system comprises three main parts which are a cultivation tank, a nutrient fluid circulation and regulation device and a movable stand; the cultivation tank and the nutrient fluid circulation and regulation device are respectively arranged on the movable stand and are communicated through a pipeline; and nutrient fluid required by the cultivation tank is supplied by the nutrient fluid circulation and regulation device. The display system provided by the invention can not only be used for teaching works such as comparing and displaying geotropism, nutrient-tropism, hydrotropism and other growth characteristics of plant root systems, but also provide a convenient experimental tool for continuously comparing and observing growth conditions of plant root systems under different environmental conditions, and the problems in the prior art such as incapability of measuring intuitionally and all sidedly, inaccurate simulation and observation results, lack of comparative observation function, and the like are solved.

The invention discloses an experimental device for simulating water-salt movement of inland saline-alkali land and a method for screening different salt isolation measures and different coverage measures for preventing salt returning of the saline-alkali land by the experimental device. The experimental device comprises a soil column, a Marriotte bottle, an evaporation control box, a reverse filter layer and moisture, salt and temperature sensors. The soil column is filled with to-be-tested soil mass of the saline-alkali land, the Marriotte bottle is communicated with the lower portion of the soil column to supply water to the soil mass, the evaporation control box is mounted at the top end of the soil column, the reverse filter layer is arranged at the bottom of the soil column, and the moisture, the salt and the temperature sensors are mounted on side walls of the soil column. The experimental device is simple in structure and easy in operation and control of experimental conditions and can be used for laboratory simulation of various experiments such as influences of different measures on soil salinity movement of the saline-alkali land and influences of underground water level on water-salt movement of inland saline-alkali land, measurement results are accurate, and reliable basic data and technical support are provided for inland saline-alkali forestation.

The invention discloses a virtual network card-based wireless channel simulation method, which comprises the following steps of: constructing the hardware environment of a simulation model; 2, constructing the simulation environment of the simulation model; 3, configuring initial parameters of simulation members by a user; 4, loading a virtual network card driver on a simulation system to complete internal initialization work; 5, beginning simulation, and performing data transceiving by the simulation members; and 6, finishing the simulation and estimating the performance of a wireless channel. The simulation method has the advantages of flexible configuration, good expandability, transparency for a low level and high reusability. The simulation method ensures the consistency of the simulation environment and real environment; the simulation results are more accurate, so the simulation reliability is improved; and the workload of simulation workers is reduced, the mutual portability of the application in the real environment and the simulation environment is easily realized, and the repeated work of developing a set of application for the simulation environment and the real environment respectively is avoided.

The invention discloses a three-dimensional human face change simulation method which comprises the steps of constructing a three-dimensional facies cranii database; standardizing a facies cranii model; extracting a human face aging and weight change rule; and simulating the human face aging and weight change. According to the three-dimensional human face change simulation method, aging and weight change are simultaneously considered; and human experience change caused by age increase and weight change can be simulated. According to the three-dimensional human face change simulation method, simulation for aging and weight change of the three-dimensional human face is firstly realized through utilizing facies cranii CT data. According to the three-dimensional human face change simulation method, on condition that three-dimensional time sequence human face data are in shortage, facies cranii data of different persons can be used; the effects of different persons are eliminated from the facies cranii data; and furthermore the aging role and the weight change role of the human face can be extracted. Furthermore an algorithm which is adopted in the three-dimensional human face change simulation method has advantages of simple and high-efficiency operation, and accurate simulation result. The three-dimensional human face change simulation method can be used for searching criminals who have absconded for many years in criminal investigation. The three-dimensional human face change simulation method can be performed in association with medical cosmetic surgery. Furthermore the three-dimensional human face change simulation method can assist cosmetic design, etc. in film and television entertainment.

The invention provides an electromechanical-electromagnetic hybrid simulation method and system. The method includes the steps that a bus with the electromagnetic transient network side connected with a power transmission line meeting a preset condition is determined as a hybrid simulation interface position, wherein the electromagnetic wave propagation delay tau on the power transmission line is larger than the electromagnetic transient simulation step size deltat; the k side of the power transmission line is connected with an electromechanical transient network, and the j side of the power transmission line is connected with the rest of networks of the electromagnetic transient network; the rest of networks of the electromagnetic transient network, the power transmission line and the electromechanical transient network are equivalent to three parts, namely, a part including the j side of the power transmission line and the rest of networks of the electromagnetic transient network, a part including the k side of the power transmission line and an equivalent circuit of the electromechanical transient network and a part including an equivalent circuit of the electromagnetic transient network and the electromechanical transient network; the three parts are solved respectively to obtain the power grid state of the electromagnetic transient network and the electromechanical transient network. By means of the technical scheme, the interface calculation amount is greatly reduced, and the calculation efficiency is improved.

The invention discloses a method for predicting the seepage field of a nodal region of an earth and rockfill dam and determining the infiltration side of the earth and rockfill dam. The method includes establishing a nodal-region three-dimensional geological detailed model of an unfavorable geologic body and fractures; setting up three-dimensional seepage and computing a grid model on the basis of the three-dimensional geological detailed model; simulating numerical values of the seepage field of the earth and rockfill dam on the basis of the three-dimensional geological detailed model, dispersing by the finite volume method according to the determined continuity equation, the water and steam two-phase N-S equation, the water and steam two-phase mixing speed equation and mixing density equation, the set boundary conditions and the seepage parameters of the actual project, solving with the SIMPLE algorithm, realizing numerical simulation of the seepage field of the earth and rockfill dam on the basis of the three-dimensional geological detailed model and thereby predicting the seepage field of the nodal region of the earth and rockfill dam. Geological information can be accurately reflected, and the seepage field of the nodal region of the earth and rockfill dam can be accurately simulated. Meanwhile, the seepage field is utilized to determine the infiltration side of the earth and rockfill dam by the VOF (volume of fluid) method.

A simulation apparatus and method in relation to a sensor network are provided. The apparatus includes: a space database storing space information; a database storing standard specifications of sensors or sensor nodes; and a modeling unit extracting information on a 3-dimensional (3D) virtual space in which a sensor or sensor node is positioned, from the space database, obtaining the characteristic of the sensor or the sensor node from the standard specification based on the extracted space information and the standard specification of the sensor or the sensor node, and modeling the sensor or the sensor node. According to the apparatus and method, a virtual wireless sensor network system identical to a real world environment can be established, and as a result, the performance of the system can be accurately measured and an optimized design of the system can be efficiently performed.

The embodiment of the invention provides a transformer direct-current magnetic bias simulation method and device and relates to the field of transformer simulation. Real situations of a magnetization curve under the influence of direct-current magnetic bias can be simulated more precisely, and accordingly accurate simulation of distortion exciting current under direct-current magnetic bias is achieved on the basis of the magnetization curve. The method includes the steps that a direct-current bias flux density deltaB0 generated by direct current is calculated, and a Bm-deltaB0 curve is calculated, wherein Bm is work flux density of a transformer; according to the Bm-deltaB0 curve, a bias-free magnetization curve in a transformer model is corrected, and according to the corrected bias-free magnetization curve and the transformer model, the magnitude of exciting current, waveform and harmonic components in the transformer are determined. The method and device are used for simulating transformer direct-current magnetic bias.

The invention discloses a gear knock simulation method and system for an automatic gearbox of a wet dual clutch. The method comprises the following steps: pre-collecting a material, wherein the material comprises a structure principle chart of a power transmission system, a key parameter of a transmission part and a three-dimensional model of each gear shaft system; pre-utilizing the structure principle chart of the power transmission system and constructing a knock simulation model of the whole power transmission system according to a lump-mass method; then constructing mass equivalent models of all parts in the power transmission system according to the material; successively constructing sub models of all the parts according to the mass equivalent models of all the parts; inputting the sub models of all the parts and the key parameter of the transmission part into the knock simulation model; as the torsional vibration of the transmission system is an important factor generated by gear knock, the sub models of all the parts and the key parameter of the transmission part can briefly and accurately reflect the torsional vibration, so that the knock simulation method and system disclosed by the invention can perform gear knock simulation on power transmission systems under different working conditions.

The present invention relates to a wind tunnel for researching snow drift. The wind tunnel comprises a cave body, an environment simulation device arranged inside the cave body, a measurement controlsystem and a driving device. Through an installation rod movably arranged in the cave body, an installation plate which is provided with a spraying head is connected, and the translation and rotationof the installation plate are realized. Through the movable installation plate and a fan set arranged in a matrix, the simulation of a complicated snowfall field and a complex wind field can be realized, thus the relation between a building roof structure and building distribution in a building group and the snow drift under a wind field effect is researched, and wind tunnel plays a guiding role in architectural design and urban planning in an area with heavy snowfall.

The invention discloses a power plant simulation system taking frequency deviation into consideration. An SFR (system frequency response) expansion model considering a boiler/auxiliary engine is established. The operating process of a thermal power plant is simulated on the basis of considering that substantial deviation of system frequency causes power output fluctuations of the power plant auxiliary engine. A boiler/auxiliary engine model is additionally arranged, influences imposed on power output by the frequency are taken into consideration, an actual condition that power output of a unit increases firstly along with frequency reduction and then decreases when the frequency reduces substantially can be simulated, the frequency dynamic process within a wider range can be simulated more accurately, and influences imposed on the boiler or the auxiliary engine by wide-range deviation of the frequency are explained. According to the invention, the boiler/auxiliary engine model is additionally arranged, and the influences imposed on power output by the frequency are taken into consideration, the actual condition that power output of the unit firstly increases along with frequency reduction and decreases when the frequency reduces substantially can be simulated, and the frequency dynamic process within a wider range can be simulated more accurately.

The invention relates to an offline simulation system power system simulation test method, including that: (1) an offline simulation system is run on a computer, a power system simulation model is built, and simulation data files of the simulation model recording voltage and current data under different operational conditions are acquired; (2) a data format conversion tool is utilized to convert the data format of the simulation data file into a format required by a digital-analog conversion device, and data is screened, so as to meet different test requirements; (3) the digital-analog conversion device is utilized to convert simulation data into a real analog signal; (4) the voltage and current signals are sent to a device to be tested, test is carried out, test result is sent out in switching value form, and the switching value is acquired and recorded by a digital input acquisition device, thus completing test. The invention has the advantages that no real-time simulation calculation is required, simulation accuracy is high, simulation system is convenient to modify and expand, cost is low, operation is easy and applicability is strong.

The invention relates to a laying spreading method for a composite material. The method is technically characterized in that a Tchebychev Net model is combined with a spring model, so that the composite material can be quickly and accurately spread on a complex curved surface, and a simulation result is more accurate than that of the conventional geometrical spreading method; a local searching algorithm is adopted for node scanning, so that time complexity is lowered into a constant; and an expanding node laying method is adopted, so that a laying blank area generated by a dual-baseline method is eliminated.

The invention provides a method for simulating and optimizing an aluminum gate CMP (Chemical Mechanical Polishing) cooperative computing model. The method comprises the following simulating steps: obtaining an initial height of an aluminum gate; obtaining pressure distribution between a polishing pad and the surface of the aluminum gate through the adoption of an aluminum gate CMP pressure distribution accurate computing model according to the initial height of the aluminum gate; inputting model parameters at least including the pressure distribution between the polishing pad and the surface of the aluminum gate into the aluminum gate CMP cooperative computing model, wherein the aluminum gate CMP cooperative computing model is determined by the aluminum gate CMP pressure distribution accurate computing model and an aluminum gate CMP chemical reaction dynamic model; and simulating the aluminum gate CMP cooperative computing model within a preset time section according to parameters of the model, so as to obtain the height of the polished aluminum gate. Through the adoption of the simulating method provided by the invention, the working principle of the aluminum gate CMP is essentially disclosed and the obtained simulating result is closer to the actual and more accurate. In addition, the optimizing method can provide assistance to the process in rapidly optimizing technical parameters.

The invention discloses a method for measuring convective heat transfer coefficient of a water-rock interface during a seepage heat transfer process of a crack sample. Constant-temperature and constant-current water flow is injected to a convective heat transfer coefficient test system through a liquid constant-voltage constant-current high-precision injection system and a cold drive hot water flow constant temperature control system; a convective heat transfer coefficient h of the water-rock interface is measured through the convective heat transfer coefficient test system; during measurement, variables related to the convective heat transfer coefficient, such as flow rate, inlet water temperature, crack initial gap length b0 and crack gap length deformation delta b, all can be set according to requirements of an experimenter; the test measurement variables such as outlet water flow rate Q, crack outlet water temperature Tout, crack inner edge water temperature Ff and crack inner surface temperature Ti all can be accurately measured; finally, the convective heat transfer coefficient h is obtained by calculating. According to the method for measuring convective heat transfer coefficient of a water-rock interface during a seepage heat transfer process of a crack sample in the invention, the variables are controlled more accurately; the numerical value of the convective heat transfer coefficient h in a certain state can be obtained through an improved calculation method; and the quantitative relationship between h and different variables can be researched.

The invention discloses a method for optimizing a PI parameter of a high-voltage direct-current transmission constant-current controller. The method includes the following steps of firstly, using a high-voltage direct-current transmission quasi-steady-state model as a calculation model for parameter optimization; secondly, calculating a target function; thirdly, initiating an algorithm parameter; fourthly, calculating the feasible region of the PI parameter; fifthly, optimizing a genetic algorithm; sixthly, embedding a simplex method to judge the condition; seventhly, optimizing a mixed algorithm. The method relies mainly on the genetic algorithm while the simplex method subsidiary, the simplex method is embedded after optimization of the genetic algorithm tends to stop, and the advantages of local optimization of the simplex method are utilized while the individual variation and the global optimization capacity of population of a traditional genetic algorithm are kept. The simplified mode, namely, the quasi-steady-state model which is widely adopted during direct-current power transmission engineering calculation, is adopted, and therefore the calculation speed is high, the calculation accuracy meets the engineering requirements, the method is suitable for optimizing the parameter of the direct-current transmission system controller, and the degree of combination between the method and practical engineering is high.

The invention provides an ionized layer incoherent scattering radar simulation system, which is characterized in that a modular design idea is adopted, the system is divided into a signal simulation module, an incoherent scattering spectrum simulation module, an ionized layer parameter analysis module, a radar power simulation module and an antenna array simulation module according to a radar actual system structure and functions of each extension set, module functions are basically the same as completing functions of each system extension set, transmission and sharing of data and information among the modules can be realized, and dynamic demonstration is carried out by using an MATLAB graphical user interface function. The ionized layer incoherent scattering radar simulation system well solves a problem that the incoherent scattering radar is small in number of research platform and difficult in test, and can help the technicists to improve abilities of analyzing and solving problems and an ability of carrying out radar equipment technical research.

The invention provides a microscopic traffic flow co-simulation platform fusing vehicle dynamics. The platform comprises a microscopic traffic flow simulation model, a vehicle dynamics model and a C#language-based interactive interface, wherein the microscopic traffic flow simulation model is used for planning a vehicle running track, simulating maneuver actions of vehicles and road shape graphs,and generating road shapes reflecting road curvatures and tilt degrees, vehicle positions and vehicle velocities and accelerations; the vehicle dynamics model is used for providing reliable vehicle performance indexes and inputting geometric setting parameters, path control parameters, velocity control parameters and the like output by the microscopic traffic simulation model to the vehicle dynamics model; and the C# language-based interactive interface is used for connecting the microscopic traffic flow simulation model with the vehicle dynamics model to realize interaction between the two models. The vehicle running track closer to reality can be generated, so that the deficiency of not considering real motion conditions of the vehicles in an existing microscopic traffic flow simulationmodel during road simulation is made up for.

Method and technique for analogue circuit synthesis. An analogue circuit usually includes many circuit components, and characteristics and functions of each circuit component are controlled by many corresponding parameters. In the presented invention, selected key design parameters of selected critical circuit components, as well as optimization targets, design specification or/and design constraint, are transformed into an optimization plan, and an optimization engine iterates circuit level or system level numerical simulations by changing values of the selected key design parameters recorded in the optimization plan, so as to find optimized parameters and circuit components which allow the analogue circuit to match the design specification/constraint and to approach the optimization target. Thus a systematic automation for analogue circuit synthesis/design/optimization is achieved.

The invention relates to a numerical simulation method for the multi-field coupling induced electromotive force of an electromagnetic flow sensor. The method comprises the steps of determining a three-dimensional space dimension; adding a physical field interface according to the action mechanism of the electromagnetic flow sensor; constructing a geometric model; defining the material attribute ofeach part of the sensor; modifying the setting of each physical field, and defining boundary conditions; performing grid division; adding research types and carrying out calculation and solution; andfinally, carrying out post-processing on a calculation result to obtain a required physical quantity, especially a coupling induced electromotive force. The flow field and magnetic field distributionin the sensor can be obtained through simulation according to the actual structural size of the electromagnetic flow sensor, and the induced electromotive force is obtained by directly coupling the flow field and the magnetic field simulation result; no idealized assumption is needed, compared with induced electromotive force obtained through calculation based on a weight function formula and other methods, the induced electromotive force better conforms to the actual situation, the simulation result of the electromagnetic flow sensor is more accurate, and related research on structural optimization design of the sensor is facilitated.